<?PHP //$Id: block_section_links.php,v 1.25.2.2 2008/03/03 11:41:04 moodler Exp $

class block_section_links extends block_base {

	function init() {
		$this->title = get_string('blockname', 'block_section_links');
		$this->version = 2007101509;
	}

	function instance_config($instance) {
		parent::instance_config($instance);
		$course = get_record('course', 'id', $this->instance->pageid);
		if (isset($course->format)) {
			if ($course->format == 'topics') {
				$this->title = get_string('topics', 'block_section_links');
			} else if ($course->format == 'weeks') {
				$this->title = get_string('weeks', 'block_section_links');
			} else {
				$this->title = get_string('blockname', 'block_section_links');
			}
		}
	}

	function applicable_formats() {
		return (array('course-view-weeks' => true, 'course-view-topics' => true, 'course-edit-weeks' => true, 'course-edit-topics' => true));
	}

	function get_content() {
		global $CFG, $USER, $COURSE;

		$highlight = 0;

		if ($this->content !== NULL) {
			return $this->content;
		}

		$this->content = new stdClass;
		$this->content->footer = '';
		$this->content->text   = '';

		if (empty($this->instance)) {
			return $this->content;
		}

		if ($this->instance->pageid == $COURSE->id) {
			$course = $COURSE;
		} else {
			$course = get_record('course', 'id', $this->instance->pageid);
		}
		$context = get_context_instance(CONTEXT_COURSE, $course->id);

		if ($course->format == 'weeks' or $course->format == 'weekscss') {
			$highlight = ceil((time()-$course->startdate)/604800);
			$linktext = get_string('jumptocurrentweek', 'block_section_links');
			$sectionname = 'week';
		}
		else if ($course->format == 'topics') {
			$highlight = $course->marker;
			$linktext = get_string('jumptocurrenttopic', 'block_section_links');
			$sectionname = 'topic';
		}
		$inc = 1;
		if ($course->numsections > 22) {
			$inc = 2;
		}
		if ($course->numsections > 40) {
			$inc = 5;
		}

		if (!empty($USER->id)) {
			$display = get_field('course_display', 'display', 'course', $this->instance->pageid, 'userid', $USER->id);
		}
		if (!empty($display)) {
			$link = $CFG->wwwroot.'/course/view.php?id='.$this->instance->pageid.'&amp;'.$sectionname.'=';
		} else {
			$link = '#section-';
		}

		$sql = "SELECT section, visible
				  FROM {$CFG->prefix}course_sections
				 WHERE course = $course->id AND
					   section < ".($course->numsections+1)."
			  ORDER BY section";

		if ($sections = get_records_sql($sql)) {
			$text = '<ol class="inline-list">';
			for ($i = $inc; $i <= $course->numsections; $i += $inc) {
				if (!isset($sections[$i])) {
					continue;
				}
				$isvisible = $sections[$i]->visible;
				if (!$isvisible and !has_capability('moodle/course:update', $context)) {
					continue;
				}
				$style = ($isvisible) ? '' : ' class="dimmed"';
				if ($i == $highlight) {
					$text .= "<li><a href=\"$link$i\"$style><strong>$i</strong></a></li>\n";
				} else {
					$text .= "<li><a href=\"$link$i\"$style>$i</a></li>\n";
				}
			}
			$text .= '</ol>';
			if ($highlight and isset($sections[$highlight])) {
				$isvisible = $sections[$highlight]->visible;
				if ($isvisible or has_capability('moodle/course:update', $context)) {
					$style = ($isvisible) ? '' : ' class="dimmed"';
					$text .= "\n<a href=\"$link$highlight\"$style>$linktext</a>";
				}
			}
		}

		$this->content->text = $text;
		return $this->content;
	}
}

?>
